<template>
    <div :class="className" :style="{ height: height, width: width }" />
</template>

<script>
import echarts from 'echarts';

require('echarts/theme/macarons'); // echarts theme
import { debounce } from '@/utils';

export default {
    props: {
        className: {
            type: String,
            default: 'chart',
        },
        width: {
            type: String,
            default: '100%',
        },
        height: {
            type: String,
            default: '300px',
        },
    },
    data() {
        return {
            chart: null,
        };
    },
    mounted() {
        this.initChart();
        this.__resizeHandler = debounce(() => {
            if (this.chart) {
                this.chart.resize();
            }
        }, 100);
        window.addEventListener('resize', this.__resizeHandler);
    },
    beforeDestroy() {
        if (!this.chart) {
            return;
        }
        window.removeEventListener('resize', this.__resizeHandler);
        this.chart.dispose();
        this.chart = null;
    },
    methods: {
        initChart() {
            this.chart = echarts.init(this.$el, 'macarons');

            this.chart.setOption({
                series: {
                    type: 'sankey',
                    layout: 'none',
                    focusNodeAdjacency: 'allEdges',
                    data: [
                        {
                            name: 'a',
                        },
                        {
                            name: 'b',
                        },
                        {
                            name: 'a1',
                        },
                        {
                            name: 'a2',
                        },
                        {
                            name: 'b1',
                        },
                        {
                            name: 'c',
                        },
                    ],
                    links: [
                        {
                            source: 'a',
                            target: 'a1',
                            value: 5,
                        },
                        {
                            source: 'a',
                            target: 'a2',
                            value: 3,
                        },
                        {
                            source: 'b',
                            target: 'b1',
                            value: 8,
                        },
                        {
                            source: 'a',
                            target: 'b1',
                            value: 3,
                        },
                        {
                            source: 'b1',
                            target: 'a1',
                            value: 1,
                        },
                        {
                            source: 'b1',
                            target: 'c',
                            value: 2,
                        },
                    ],
                },
            });
        },
    },
};
</script>
